[Vortex] [PATCH] fix vortex threads and vortex_exit

[Benoit Amiaux]

Hi,

Currently, threads are not properly terminated, both under windows and 
linux. It's possible to have threads still runnning after vortex_exit() 
is called and so rogue threads can access invalid pointers.

Moreover, vortex_init doesn't properly reset __vortex_exit so it's 
impossible to have multiple vortex_init/vortex_exit cycles

Attached patch fix this.

I made a diff against vortex-r3145 as r3154 just crash at vortex_init 
for me without any changes

Bye,
AMIAUX Benoit
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